TRAG-3, a novel cancer/testis antigen, is overexpressed in the majority of melanoma cell lines and malignant melanoma

Anticancer Res. Nov-Dec 2000;20(6B):4147-51.


Background: We have identified a novel cancer/testis antigen, TRAG-3, (Taxol Resistance Associated Gene-3) that was initially discovered in search for new genes involved in drug resistance by differential display. Early study of TRAG-3 revealed minimal to absent expression in various normal tissues and over-expression in many carcinoma cell lines including several melanoma lines.

Materials and methods: Northern and RT-PCR technologies were used to evaluate TRAG-3 expression in numerous cell lines and tumor tissue.

Results: Analysis of a wider panel of normal tissues, 32 melanoma cell lines and 4 malignant melanomas demonstrates TRAG-3 expression in 25 of the 32 melanoma cell lines (78%) and four of four of the malignant melanoma tumors (100%). Of the additional eight normal tissues screened, expression was present in normal testis but absent in all other tissues. RT-PCR evaluation of TRAG-3 reveals two transcripts in many carcinoma cell lines with sequencing of these products demonstrating the 799 bp TRAG-3 transcript and a second alternatively spliced transcript, TRAG-3long TRAG-3 maps to band Xq28 within a MAGE gene complex, however sequence analysis demonstrates that TRAG-3 is not homologous to other known cancer/testis antigens.

Conclusion: TRAG-3 appears to be a novel cancer/testis antigen.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Humans
  • Melanoma / metabolism*
  • Molecular Sequence Data
  • Neoplasm Proteins / chemistry
  • Neoplasm Proteins / metabolism*
  • Reverse Transcriptase Polymerase Chain Reaction
  • Tumor Cells, Cultured / metabolism


  • CSAG2 protein, human
  • Neoplasm Proteins